Title :
Monolithic Power-Combining Techniques for Watt-Level 2.4-GHz CMOS Power Amplifiers for WLAN Applications
Author :
Afsahi, Ahmad ; Larson, Lawrence E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA
Abstract :
Two monolithic power combining schemes for CMOS power amplifiers (PAs)-distributed LC and current-mode transformer-based-are compared. Fully integrated 2.4-GHz PAs using these techniques were fabricated in a 65-nm standard CMOS technology. From a 3.3-V supply, the distributed-LC combined PA produces a saturated power of 31.5 dBm with peak power-added efficiency (PAE) of 25%. The current-mode transformer-based PA combiner produces 33.5-dBm saturated power with 37.6% peak PAE. With gm -linearization and digital pre-distortion, these PAs transmit 25.5 and 26.4 dBm with - 25-dB error vector magnitude for a 54-Mb/s orthogonal frequency division multiplexing signal, respectively.
Keywords :
CMOS analogue integrated circuits; LC circuits; OFDM modulation; UHF integrated circuits; UHF power amplifiers; current-mode circuits; monolithic integrated circuits; power combiners; transformers; PA; PAE; WLAN application; bit rate 54 Mbit/s; current-mode transformer-based-amplifier; digital pre-distortion; distributed LC amplifier; efficiency 25 percent; efficiency 37.6 percent; error vector magnitude; frequency 2.4 GHz; gain -25 dB; gm-linearization; monolithic power-combining technique; orthogonal frequency division multiplexing signal; power-added efficiency; size 65 nm; voltage 3.3 V; watt-level CMOS power amplifier; CMOS integrated circuits; CMOS technology; Circuit faults; Impedance; Inductance; Inductors; Q factor; CMOS; linearization; power amplifier (PA); power combiner; wireless local area network (WLAN);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2013.2238245
